Source : Webster's Revised Unabridged Dictionary (1913)

Chemically \Chem"ic*al*ly\, adv.
   According to chemical principles; by chemical process or
   operation.

Source : WordNet®

chemically
     adv 1: by the use of chemicals; "chemically fertilized" [syn: {with
            chemicals}]
     2: with respect to chemistry; "chemically different substances"